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    Updating a table using a scalar subselect

    Copy and paste the following SQL to your SQLyog free Community Edition query window.Note that the SQL needs to end with semi-colon if you have multiple queries in the query window.Most of the queries in the tutorials need Northwind My SQL database, you can download the database script on this page.

    A subquery that returns one or more rows of values is also known as row subquery.The only difference to a simple SELECT is, that it is enclosed in parenthesis.Depending on the type of the created result there are three classes of subqueries: Every type can be used on all positions where the type it stands for may occur: the scalar value subquery where a single value may occur, the row subquery where a single row may occur and the table subquery where a table may occur.In the same way, you can think of a noncorrelated scalar subquery as a parameterized value.Accordingly, you can specify a correlated scalar subquery in a statement in the same way as a column, while you can specify a noncorrelated scalar subquery in the same way as you would a parameterized value wherever a column or parameterized value is allowed.

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